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Visualization and quantification of topoisomerase–DNA covalent complexes using the trapped in agarose immunostaining (TARDIS) assay

Lookup NU author(s): Dr Ian CowellORCiD, Professor Caroline AustinORCiD


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© 2018, Springer Science+Business Media, LLC.The TARDIS assay was originally developed as a means of detecting and quantifying melphalan and cisplatin DNA adducts at the single cell level, but it has since been adapted to quantify topoisomerase DNA complexes that result from the actions of topoisomerase poisons and this is currently the main use of the assay. The method employs sensitive immunofluorescent detection to quantify topoisomerase molecules covalently coupled to DNA in what are often referred to as cleavage complexes. Free topoisomerase molecules, and other cellular constituents are first removed using salt-detergent extraction of agarose-embedded, unfixed cells. Using these stringent extraction conditions, genomic DNA remains in place in the agarose as “nuclear ghosts,” and any covalent attached molecules can be detected and quantified by immunofluorescence with a low background.

Publication metadata

Author(s): Cowell IG, Austin CA

Publication type: Book Chapter

Publication status: Published

Book Title: DNA Topoisomerases: Methods and Protocols

Year: 2018

Volume: 1703

Pages: 301-316

Online publication date: 25/11/2017

Acceptance date: 02/04/2016

Series Title: Methods in Molecular Biology

Publisher: Humana Press

Place Published: New York


DOI: 10.1007/978-1-4939-7459-7_21

Library holdings: Search Newcastle University Library for this item

ISBN: 9781493974597